1) six hundred and sixty six, the meaning of which is the basis of much vain speculation
chi xi stigma
khee xee stig'-ma
The 22nd, 14th and an obsolete letter (G4742 as a cross) of the Greek alphabet (intermediate between the 5th and 6th), used as numbers; denoting respectively 600, 60 and 6; 666 as a numeral
KJV Usage: six hundred threescore and six.